Gravitropism in leaves of Arabidopsis thaliana (L.) Heynh.
Gravitropism in leaves of Arabidopsis thaliana (L.) Heynh.
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DOI：
10.1093/pcp/pci237
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发表时间：
2006-02-01
影响因子：
4.9
通讯作者：
Tsukaya, H
中科院分区：
文献类型：
--
作者：
Mano, E;Horiguchi, G;Tsukaya, H
在高等植物中，茎和根分别表现出负向地性和正向地性。然而，目前的知识，叶片的重力反应是缺乏的。在这项研究中，我们分析了拟南芥莲座叶在光和暗条件下的定位和运动。我们发现在连续白色光下莲座叶的径向定位不受重力方向的影响。相反，当植物被转移到黑暗中，叶片向上移动，表明负向重力性。磷酸葡萄糖变位酶和芽向重力性2-1突变体的分析表明，在叶柄中的沉积淀粉体是重要的重力感知，是在茎和根的情况下。此外，我们的详细的生理分析揭示了一个独特的特点，即运动后的黑暗转移，可以分为负向重力性和nastic运动。莲座叶的方向归因于这些运动的组合。
In higher plants, stems and roots show negative and positive gravitropism, respectively. However, current knowledge on the graviresponse of leaves is lacking. In this study, we analyzed the positioning and movement of rosette leaves of Arabidopsis thaliana under light and dark conditions. We found that the radial positioning of rosette leaves was not affected by the direction of gravity under continuous white light. In contrast, when plants were shifted to darkness, the leaves moved upwards, suggesting negative gravitropism. Analysis of the phosphoglucomutase and shoot gravitropism 2-1 mutants revealed that the sedimenting amyloplasts in the leaf petiole are important for gravity perception, as is the case in stems and roots. In addition, our detailed physiological analyses revealed a unique feature of leaf movement after the shift to darkness, i.e. movement could be divided into negative gravitropism and nastic movement. The orientation of rosette leaves is ascribed to a combination of these movements.